Tetromino/Tetris block cipher

A puzzle that displays tetromino blocks based off of controller inputs, and an anticube prize for cracking the nearby pillar's code. (image) (link to finished cipher)

The classroom in the 8-cube Blade Runner city then shows how to interpret the pillars with tetromino inscriptions. Here's one wall, but relate it to the others:

Numbers cipher

Like the alphabet, there isn't one proper way to do this, but you might be interested in the 16-cube temple's classroom. Instead of trekking back, this is what it looks like:

Hint:

Those are "equals" signs, and the last picture is arithmetic. Also, the figure/ground is confusing—pay attention to the box and its internal vertical/horizontal lines, not the "C" shapes. (link to finished cipher)

Also, there are more "three-number-sums-that-equals-to-ten" drawings at the sides of the library where the planets are rotating. So, there you go, even more hints. (but I confess I couldn't figure it out by myself)
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Denilson SáFeb 13 at 21:20

There is a room where a pillar flashes the appropriate shape when you apply the input near it. There's a tetris-shaped chain next to it to test the inputs on. It looks like this: http://i.stack.imgur.com/pfnDd.png

It was really satisfying to figure that one out for myself, I loved that puzzle.

For the numbers:

The numbers are in order on a wall (in the big-head village I think), and 1-4 are on connected treasure maps.